When fertilization occured then ovule develops from the placenta of the ovary that are the site of formation of megasphores. Ovule consist of three main parts. If only one ovule, or a subset of the total ovules, is fertilized, it can result in The relationship between fertilization, seed development, fruit. The ovule and the seed are studied under the branch of biology referred to as botany. The ovule is the female gametophyte which after.
For the seed, a hard covering layer called testa acts as the coat that protects the inner delicate structures of a seed. The helium The helium is a small point found on the surface of both an ovule and a seed.
The difference comes in where the helium in an ovule is the point at which the body of the ovule is attached to the funiculus. Totally different with this is the helium of a seed. The helium in a seed is the point at which the seed attaches itself to the fruit. A black scar helium is evident on the seed.
The cotyledon This is a seed leaf. As it is proven, leaves in plants are essential in that they manufacture and in some store food.
Differences Between An Ovule And A Seed | Difference Between | An Ovule And A Seed
In the case of a seed, the cotyledon plays the role of providing food for the seed. The cotyledon is highly packed with starch. In an ovule, the parenchymatous cells named nucellus store some food energy that is used by the embryo sac for the development of the ovule. The micropile The micropile is a tiny opening on the surface of an ovule or a seed. The difference of the seed micropile and the ovule micropile is brought about by their different functions. In an ovule, the micropile provides an entrance of the pollen into the ovule structure in order to carry out the process of fertilization.
Seed & Fruit Development - Fruit & Nut Research & Information Center Education
When it comes to the seed structure, the micropile acts an entry point of water and air that are utilized in the process of germination. The embryo In a seed the embryo is the most important part because its cells differentiate and grow into the various tissues that constitute the plant. In the embryo sac is where the egg cell which fuses with the pollen to form a zygote is found.
An analysis of the exon-intron structures and conserved motifs provided further insight into the evolutionary relationships between these genes. Evaluation of synteny indicated that segmental and tandem duplications have contributed greatly to the expansion of the grape homeobox gene superfamily.
Synteny analysis between the grape and Arabidopsis genomes provided a potential functional relevance for these genes.
Differences Between An Ovule And A Seed
The tissue-specific expression patterns of homeobox genes suggested roles in both vegetative and reproductive tissues. Expression profiling of these genes during the course of ovule development in seeded and seedless cultivars suggested a potential role in ovule abortion associated with seedlessness. This study will facilitate the functional analysis of these genes and provide new resources for molecular breeding of seedless grapes. Introduction Homeobox HB transcription factors often act as master regulators of organ identity and are encoded by a large and conserved gene family.
These were originally characterized as regulators of morphogenesis in the fruit fly, Drosophila melanogaster 1.9 MIN OF DANK BIRB MEMES #1
Subsequently, numerous HB-encoding genes have been identified from a range of eukaryotes 3including Arabidopsis 4rice 5barley 6and humans 7. The characteristic three-dimensional structure of the HD comprises three alpha-helices, with the first and second helices forming a loop structure 9. The second and third helices form a helix-turn-helix motif, which can interact with specific DNA sequences, allowing for regulation of expression of target genes 10 Each HB gene family is named according to unique typical domains and motifs outside of the HD, features that may enable functional differences of each subfamily.
HB genes are involved in many aspects of plant growth and development, and participate in various hormone response pathways 13 — For example, members of HD-ZIP, the largest HB protein family, play roles in epidermal cell differentiation 16floral organogenesis, fruit ripening 15embryonic shoot meristem formation, embryo patterning and vascular development Interestingly, this family is apparently specific to plants Members of the KNOX family are known to be required for nuclear localization and homo-dimerization, and suppress target gene expression 19 Additionally, studies have shown that KNOX genes are involved in cell differentiation and shoot apical meristem maintenance 21 ,